1. Barlow , R. E. , Russel , J. D. and Singpurwalla , N. D. Reliability and fault tree analysis , SI AM , Philadelphia , 1975
2. Haasl , D. F. , et al. Fault Tree Handbook , U. S. Nuclear Regulatory Commission , Washington , D. C , U. S. Department of Commerce, National Technical Information Service , January 1981